first stage cooling
一级冷却
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The results show that the temperature reduces fast at first stage, because of the larger difference between blade and air. Then, the temperature reduction rate decreases slowerly, in cooling process.
结果表明：初始时刻叶片表面和环境温差较大，温降较快，随着冷却过程进行，温降速度变缓；
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